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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984f09c884bf9c3e0bf5d7a110906bdcf4b6e4136f9316908231b5d44b8f2d8e' 
  AND token = '9Z4x7r2/2J0mkNA2LJ6aENRH4dL95zTfmTAno5+THs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}